CYCLIC OXIDATION OF Ti-48%Al-2%Cr-2%Nb-(0~1%)W ALLOYS BETWEEN 800 AND 1000°C IN AIR

2010 ◽  
Vol 17 (02) ◽  
pp. 141-146
Author(s):  
SANG-HWAN BAK ◽  
DONG YI SEO ◽  
SEON-JIN KIM ◽  
JAE CHUN LEE ◽  
DONG BOK LEE
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Alloying Elements ◽  
Tial Alloys ◽  
Oxidation Characteristics

Ti-48%Al-2%Cr-2%Nb-(0, 0.5, 1) at.%W alloys were synthesized via the powder metallurgical route, and cyclically oxidized at 800, 900, or 1000°C in air for up to 100 h in order to find the effects of W on their oxidation characteristics. At 800°C, they oxidized relatively slowly, and the scales were thin and adherent. At 900°C, the scales began to spall locally. At 1000°C, they spalled repetitively during oxidation. Cr , Nb , and W improved the cyclic oxidation resistance of TiAl alloys. The oxides formed were TiO2 and Al2O3 , which contained the alloying elements of Cr , Nb , and W . Nitrides formed were TiN and Ti2AlN .

STUDY ON CYCLIC OXIDATION RESISTANCE OF HIGH NIOBIUM CONTAINING TiAl BASE ALLOY WITH ERBIUM

2013 ◽  
Vol 49 (11) ◽  
pp. 1369 ◽  
Author(s):  
Ziqi GONG ◽  
Ziyong CHEN ◽  
Lihua CHAI ◽  
Zhilei XIANG ◽  
Zuoren NIE
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Base Alloy

Improvement of the Oxidation Resistance of TiAl Alloys Using Controlled Gaseous Fluorination

2019 ◽  
Vol 11 (15) ◽  
pp. 37-48 ◽  
Author(s):  
Patrick J. Masset ◽  
Michael Schütze
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys

Effects of Yttrium on Cyclic Oxidation Resistance of Co-10Cr-5Al Alloy at 700 °C

2014 ◽  
Vol 528 ◽  
pp. 25-29
Author(s):  
Ling Yun Bai ◽  
Xian Chao Xu ◽  
Jun Huai Xiang ◽  
Yun Xiang Zheng ◽  
Jun Wang
Keyword(s):  
Oxide Scale ◽  
Oxidation Resistance ◽  
Oxidation Rate ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Adhesive Property ◽  
Complex Mode ◽  
Rate Law ◽  
Parabolic Rate

The cyclic oxidation behavior of Co-10Cr-5Al alloys in atmosphere at 700 °C was investigated. The addition of 0.3 at.% Y changed the oxidation behavior from the approximate parabolic rate law to complex mode. The scale grown on the surface of Co-10Cr-5Al cracked seriously, while the oxide scale the Y doped alloy had better adhesive property. Yttrium doped in the sample promoted the forming of continuous Al2O3layer and decreased the oxidation rate of Co-10Cr-5Al alloys.

An Effective Approach to Improve the Oxidation Resistance of Ti-6Al-4V Alloy by Combination of Phosphorization and Silica Coating

2011 ◽  
Vol 148-149 ◽  
pp. 534-537
Author(s):  
Chun Xiang Gao
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Oxidation Behavior ◽  
Sol Gel ◽  
Synergetic Effect ◽  
Silica Coating ◽  
Dip Coating ◽  
Sio2 Coating ◽  
Amorphous Sio2 ◽  
Dip Coating Technique

A very effective approach to improve the oxidation resistance of Ti-6Al-4V alloy was proposed. The Ti-6Al-4V alloy was firstly phosphated and then coated by silica using sol-gel dip-coating technique. A duplex layer of TiP2O7 and amorphous silica was synthesized at the alloy surface. The isothermal and cyclic oxidation behavior of the treated alloy with silica coating and the corresponding bare alloy was investigated at 600 oC in static air to investigate the synergetic effect of phosphorization and amorphous SiO2 coating on the oxidation resistance of the alloy. The isothermal and cyclic oxidation resistances of the alloy were greatly improved.

Effects of Dy on cyclic oxidation resistance of NiAl alloy

2009 ◽  
Vol 19 (5) ◽  
pp. 1185-1189 ◽  
Author(s):  
Hong-bo GUO ◽  
Xiao-yan WANG ◽  
Ji LI ◽  
Shi-xing WANG ◽  
Sheng-kai GONG
Keyword(s):  
Oxidation Resistance ◽  
Cyclic Oxidation ◽  
Nial Alloy

Some X-Ray Observations on the Oxidation Characteristics of Binary Niobium Alloys

1958 ◽  
Vol 2 ◽  
pp. 71-77
Author(s):  
Ralph H. Hiltz
Keyword(s):  
Oxidation Resistance ◽  
Valence State ◽  
Oxidation Rate ◽  
Definite Description ◽  
Substantial Improvement ◽  
Niobium Alloys ◽  
X Ray ◽  
Pure Niobium ◽  
Oxidation Characteristics ◽  
Ionic Size

AbstractPresent knowledge of the effect of alloying on the oxidation characteristics of niobium is limited almost entirely to oxidation rate and oxygen diffusion rate data. In an effort to determine the mechanism by which alloying elements increase or decrease the oxidation rate of niobium, an x-ray study of niobium alloys was performed. Both x-ray diffraction and fluorescent studies were conducted on the base metal before and after oxidation, on the scale formed, and on the interface between the metal and the scale. From the data obtained, a definite description of the mechanism was not possible, but it appears that the Nb0 film between the metal and the Nb203 scale is the rate controlling factor. The elements Ti, Mo, Cr, W, and V which produce a substantial improvement in oxidation resistance effect the formation of a second oxide structure within the Nb0 film. All the elements which provide a measurable increase in oxidation have either a similar ionic size or a +3 valence state and in most cases have both. Elements not having a +3 valence state or similar ionic size, i.e., Cu, Mn, Si, and Zr, do not improve oxidation resistance, in fact Si and Zr act to eliminate the Nb0 film and the oxidation rate of these alloys is greater than pure niobium.

The effect of Ta additions on the oxidation resistance of SPS-produced TiAl alloys

2020 ◽  
Vol 106 (7-8) ◽  
pp. 3203-3215 ◽  
Author(s):  
Prince Valentine Cobbinah ◽  
Wallace Matizamhuka ◽  
Ronald Machaka ◽  
Mxolisi Bredon Shongwe ◽  
Yoko Yamabe-Mitarai
Keyword(s):  
Oxidation Resistance ◽  
Tial Alloys
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